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Finding the Fourth Proportional to 987.93, 1,363.42 and 568.38

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Solution

The fourth proportional to 987.93, 1,363.42 and 568.38 is: 784.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.93 : 1,363.42 = 568.38 : x
  2. Step 2: Convert to fraction form
    987.93/1,363.42 = 568.38/x
  3. Step 3: Cross multiply
    987.93x = 1,363.42 × 568.38
  4. Step 4: Simplify right side
    987.93x = 774,946.48
  5. Step 5: Solve for x
    x = 774,946.48/987.93
  6. Step 6: Final answer
    x = 784.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.